RFR: 8253795: Implementation of JEP 391: macOS/AArch64 Port [v21]

[Anton Kozlov]

On Mon, 1 Mar 2021 10:31:19 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Anton Kozlov has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Merge remote-tracking branch 'origin/jdk/jdk-macos' into jdk-macos
>>  - Minor fixes
>
> src/hotspot/cpu/aarch64/globalDefinitions_aarch64.hpp line 62:
> 
>> 60: 
>> 61: #if defined(__APPLE__) || defined(_WIN64)
>> 62: #define R18_RESERVED
> 
> #define R18_RESERVED true```

We always check for `R18_RESERVED` with `#if(n)def`, is there any reason to define the value for the macro?

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PR: https://git.openjdk.java.net/jdk/pull/2200